296 University of California Puhlications in Zoology. [Vol.4 



66. Myriozoum subgracile d'Orbigny. 



PI. 21, fig. 58. 



Myriosoum suhgracile d'Orbigny, 1850-52, p. 662. 

 Myriozoum subgracile, Smitt, 1867, p. 48. 

 Myriosoum subgracile, Hineks, 1877, p. 106. 



Zoarimn ramose, having much the same general appearance as 

 the foregoing species, branches slimmer, less robust. Zooecia im- 

 mersed, alternate, front wall granular not punctate (pi. 21, fig. 

 58), except at the base of the colony where the zooecia are hidden 

 under a calcified porous layer. Orifice, or., higher than broad, 

 rounded above, lower margin straight and possessing a M^ell 

 marked sinus. A small avicularium, av., above each zooecium, 

 mandible directed obliquely downward. Ooeciaf 



This species has been obtained in but one locality, appearing 

 in the collection from San Juan Co., Puget Sound. These speci- 

 mens possess but one avicularium above the zooecium. although a 

 specimen examined from Baffins Bay has two small avicularia 

 above each zooecium. 



Hippothoa Lamouroux. 



MolUa (part) Smitt, 1867. 

 Hippothoa, Busk, 1852. 

 Hippothoa, Hineks, 1880. 



Zoarimn forming a delicate tracery on stones, roots, etc. 

 Zooecia minute, distant, caudate, connected with one another by a 

 slender prolongation of the posterior part of the zooecium so as to 

 form a linear series; branches given off from the sides of the 

 zooecia ; orifice subterminal, suborbicular, with the lower margin 

 sinuated or produced. 



67. Hippothoa divaricata Lamouroux. 



PI. 21, figs. 59, 60. 



Hippothoa divaricata Lamouroux, 1821, p. 82, pi. 80, figs. 15, 16. 

 Hippothoa divaricata, Johnston, 1847, p. 291, pi. 51, figs. 3, 4. 

 Hippothoa divaricata. Busk, 1852, p. 30, pi. 18, figs. 3, 4. 

 Hippothoa patagonica Busk, 1852, p. 30, pi. 17, fig. 1. 

 Mollia divaricata, Smitt, 1867, p. 17 and 112, pi. 25, figs. 86, 87. 

 Hippothoa divaricata, Hineks, 1880, p. 288, pi. 44, figs. 1-4; pi. 1, 

 fig. 2. 



